If f(x) = 2x2 – 3x – 1, then f(-1)=

 f(-1) = 4

Step-by-step explanation:

f(x) = 2x² - 3x - 1

f(-1) = 2(-1)² - 3(-1) - 1

      = 2(1) + 3 - 1

      = 2 + 2

      = 4

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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